20003123 has 12 divisors (see below), whose sum is σ = 24282000. Its totient is φ = 16399152.

The previous prime is 20003117. The next prime is 20003131. The reversal of 20003123 is 32130002.

It is not a de Polignac number, because 20003123 - 2⁴ = 20003107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20003173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7748 + ... + 10001.

It is an arithmetic number, because the mean of its divisors is an integer number (2023500).

Almost surely, 2^20003123 is an apocalyptic number.

20003123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20003123 is a deficient number, since it is larger than the sum of its proper divisors (4278877).

20003123 is a wasteful number, since it uses less digits than its factorization.

20003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17786 (or 17779 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20003123 is about 4472.4851033849. The cubic root of 20003123 is about 271.4558894679.

Adding to 20003123 its reverse (32130002), we get a palindrome (52133125).

The spelling of 20003123 in words is "twenty million, three thousand, one hundred twenty-three".